Respiration

Question 1

What is respiration and how does it release energy?

Answer 1

• Respiration is a chemical reaction which releases energy from glucose with or without oxygen, the products of this reaction are also carbon dioxide and water
• The energy is released in the form of ATP

Respiration happens at a cellular level (cellular respiration)

Question 2

What is the function of ATP?

Answer 2

• To provide energy for cells
• Examples include:
  Mainting a constant body temperature
  Cell division and growth
  Active Transport
  Muscular contractions

Question 3

What are the differences between aerobic and anaerobic respiration?

Answer 3

• Aerobic requires oxygen, anaerobic does not
• Aerobic produces alot of energy, anareobic produces little energy
• Aerobic completely breaks down the glucose, anaerobic does it incompletely
• The products differ
• Aerobic will happen when there is abundant oxygen, anaerobic will happen when there is insufficient oxygen

Question 4

What is the word equation for aerobic respiration in all living organisms?

Answer 4

Oxygen + Glucose –> Carbon Dioxide + Water

ATP is of course released, but you should not write it in the equation

Question 5

What is the balanced symbol equation for aerobic respiration in all living organisms?

Answer 5

6O₂ + C₆H₁₂O₆ –> 6CO₂ + 6H₂O

Question 6

What is the word equation for anaerobic respiration in animals?

Answer 6

Glucose —> Lactic acid

Question 7

What is the word equation for anaerobic respiration in plants and fungi?

Answer 7

Glucose —> Carbon dioxide + Ethanol

Question 8

Outline an investigation into the release of carbon dioxide from respiration

Answer 8

• Put 10 germinating seeds in one test tube, 10 dead seeds in another, and 10 glass beeds in another
• Add hydrogencarbonate indicator to each test tube, and seal it off
• Wait 3 hours, and then observe the colour of the indicator
• The hydrogencarbonate in the tube with the germinating seeds should be yellow, as carbon dioxide was released, and in the other 2 test tubes it should be orange/red as there was no change in carbon dioxide concentration

Question 9

Outline an investigation of heat release from respiration

Answer 9

• Seal dead seeds, in one flask, and germinating seeds in another with thermometers in each
• Record the initial temperature, and wait 4 days
• Record the final temperature
• You should see that the flask with the germinating seeds experienced a large temperature increase an respiration is an exothermic reaction but the other flask did not